A: Note that this question is entirely hypothetical. We didn’t think about this scenario because it doesn’t make sense for it ever to happen. Why on earth would anyone even try to prevent time travel from being invented unless their win conditions were in place? Only if someone was just really sick of the game…

Andy concurs, and gives the following possible options: If you choose to un-invent time travel when you won’t be the winner, it can only be because you just want the game to end. If that’s the case, then that player isn’t having fun, so for them, the best thing is just to end it. Sounds like no one is winning to me! You could also just say the other two players tied. It’s a draw. Your choice.